Bartering! (Shirt VS Bag) - Continued 2

Struggling with this pattern yet again, I'm really feeling something got left out of the directions, which is decidedly annoying.  My finished (so far) product has the correct bottom & top widths, but incorrect height.  What is left to add will not make up the 4 3/4" that is missing!!!  What the hell?!  I mean honestly people, if a pattern has been published you would think it would have been tested by more than just the designer.  *fumes*  I do not like looking inept at my art but this seriously makes me feel like I'm a dunce that I keep screwing this up.
Needless to say, the original estimate on yarn needed was 5 skeins.  However due to the severe amount of technical difficulties involved I will not be buying the remaining 4 at one time but rather get the remaining one at a time because I feel that that estimate will likely be off...

...sew many things, sew little thyme for ewe and eye...